Quiz 2D Kinematics (intermediate)

1. Suppose you and your friend are playing volleyball. In between, you are a large net. You know that hitting the ball gives it a parabolic shot whose initial speed is known. You are serving, and you want the volleyball just to pass the net and beat your friend's chest (the same height from which you serve). The only thing you need to determine is the angle at which the ball should come out. What other information do you need?

2. Consider a parabolic trajectory. Which graph(s) best represent the trajectory described by the projectile in the x- and y- directions?

3. Suppose a child is ill-advisedly playing catch with a ball while riding a public transit bus. The kid tosses the ball into the air, and a concerned senior citizen watches the game from the sidewalk. What is the motion the ball will follow for an observer on the ground?